Translation: Metzada or Massada?

Hello,
What is the correct way to say the name of one of the most important historical and touristic locations in Israel — Metzada or Massada? In various publications, Hebrew and foreign, the name appears in different spellings and confuses many people — both Israelis and tourists. There should be a consistent policy — the name should appear in the same spelling upon signs and books and in speeches, and all tourist guides should be trained to pronounce it consistently. You can count on the Hebrew Academy to recommend the compulsory spelling — one that should be known to everyone.